The mediation ends if—
(a) the parties to the dispute enter into a binding and enforceable agreement resolving the dispute; or
(b) an arbitral proceeding in respect of the dispute starts under subdivision 4 ; or
(c) a party to the dispute starts any other proceeding in relation to the dispute; or
(d) the mediator and the parties to the dispute agree to end the mediation; or
(e) the mediator decides continuing the mediation has, for any other reason, become unnecessary or impossible.